Wendy is one of Mavis' friends, that is helping her run the hotel their way. Wendy likes to like fun with her when she can, get a bit carried away at time when she is excited and can very honest at times, mostly with the slip of the tongue.
Seeing him causes her to melt.
In Breakfast at Lydia's when Pedro yells "you should wear hats more Wendy, they really bring out your eyes!" she whispers "thank you" while holding her palms together.